Fair Value Measurements (Assets and Liabilities at Fair Value on Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Dec. 29, 2012		Dec. 31, 2011
Total [Member]
Assets:
Cash equivalents	$ 96.5		$ 546.0
Interest rate swap			4.4	[1]
Total	174.6		641.5
Liabilities:
Total	21.8		26.3
Total [Member] | Prepaid Expenses and Other Current Assets [Member]
Assets:
Investments	44.2	[2]	52.4	[2]
Total [Member] | Other Assets [Member]
Assets:
Investments	33.9	[1]	38.7	[1]
Total [Member] | Other Accrued Liabilities [Member]
Liabilities:
Contingent consideration	21.8	[3]	26.3	[4]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Cash equivalents	91.0		290.0
Interest rate swap			0	[1]
Total	105.5		312.6
Liabilities:
Total	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Prepaid Expenses and Other Current Assets [Member]
Assets:
Investments	14.5	[2]	22.6	[2]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Assets [Member]
Assets:
Investments	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Accrued Liabilities [Member]
Liabilities:
Contingent consideration	0	[3]	0	[4]
Significant Observable Inputs (Level 2) [Member]
Assets:
Cash equivalents	5.5		256.0
Interest rate swap			4.4	[1]
Total	69.1		328.9
Liabilities:
Total	0		0
Significant Observable Inputs (Level 2) [Member] | Prepaid Expenses and Other Current Assets [Member]
Assets:
Investments	29.7	[2]	29.8	[2]
Significant Observable Inputs (Level 2) [Member] | Other Assets [Member]
Assets:
Investments	33.9	[1]	38.7	[1]
Significant Observable Inputs (Level 2) [Member] | Other Accrued Liabilities [Member]
Liabilities:
Contingent consideration	0	[3]	0	[4]
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Cash equivalents	0		0
Interest rate swap			0	[1]
Total	0		0
Liabilities:
Total	21.8		26.3
Significant Unobservable Inputs (Level 3) [Member] | Prepaid Expenses and Other Current Assets [Member]
Assets:
Investments	0	[2]	0	[2]
Significant Unobservable Inputs (Level 3) [Member] | Other Assets [Member]
Assets:
Investments	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) [Member] | Other Accrued Liabilities [Member]
Liabilities:
Contingent consideration	$ 21.8	[3]	$ 26.3	[4]

[1] Included in Other Assets on the balance sheet.

[2] Included in Prepaid Expenses and Other Current Assets on the balance sheet.

[3] Included in Other Accrued Liabilities and Accrued Claims and Other Liabilities on the balance sheet.

[4] Included in Other Accrued Liabilities on the balance sheet.